Monthly Active Subscriptions and MRR

SQL practice question · Hard · Date & Time · Adobe

A subscription is active in a month if `start_date` <= the month's last day AND (`end_date` IS NULL OR `end_date` >= the month's first day). For EVERY month from 2026-01 to 2026-06 (inclusive, even months with no active subscription) return `month` ('YYYY-MM'), `active_subs`, `mrr` = sum of `monthly_fee` of active subscriptions (ROUND 2, 0 when none). Order by `month`.

Table: subscriptions

Schema of subscriptions
ColumnType
sub_idINTEGER
customer_idINTEGER
planTEXT
monthly_feeREAL
start_dateDATE
end_dateDATE
Sample rows of subscriptions
sub_idcustomer_idplanmonthly_feestart_dateend_date
1101Photography20.992026-01-15NULL
2102Acrobat Pro152025-11-012026-02-10
3103Express9.992026-03-012026-03-31
4104All Apps54.992026-05-20NULL
5105Photography20.992026-07-01NULL
Expected output on the sample data
monthactive_subsmrr
2026-01235.99
2026-02235.99
2026-03230.98
2026-04120.99
2026-05275.98
2026-06275.98

Solve it in the live editor on this page — run on sample data, then submit against hidden tests.

‹ 90th Percentile Daily Sales by Region · Merge Overlapping License Periods ›

T
Tech Town
Log InSign Up Free
Home SQL Python DSA Power BI Snowflake Databricks Spark Gen AI Practice Problems Contest Question Asked in Interview Blog
SQL Interview Practice

Company-wise SQL questions

{{ totalCount }} questions in the style asked at Amazon, Microsoft, Google, Meta, Flipkart and more — {{ hardPct }}% Hard. Write SQL in a real database engine in your browser, run it on sample data, then evaluate against hidden tests.

🏆 Weekly SQL Contest
{{ totalCount }}
Questions
{{ companyCount }}
Companies
{{ prog.total.solved }}
Solved
Bookmark Question Companies Difficulty Category Status
{{ r.n }} - {{ r.title }} {{ c }} {{ r.difficulty }} {{ r.category }} {{ r.statusIcon }}
No questions match these filters.
Showing {{ rangeLabel }} of {{ filteredCount }}

Company tags show where this type of question is commonly reported in interviews. Questions, data and solutions are written by TechTown.
← All questions

{{ cur.n }} - {{ cur.title }}

🏆 Contest {{ contestWeek }}
{{ cur.catLabel }} {{ cur.diffLabel }} {{ c }}
Embed this questionPaste on a blog, course page or LMS. Free to use — educator guide 
{{ embedCode }}

{{ cur.statement }}

Table: {{ tb.name }}
ColumnType {{ c.name }}{{ c.type }}
{{ h }} {{ v.text }}
Expected output on the sample data:
{{ h }} {{ v.text }}
  • {{ h }}

No submissions yet. Press Evaluate to submit your query.
{{ s.verdict }} {{ s.meta }}
The solution unlocks after you solve this question or after 3 evaluations that didn't pass ({{ failCount }}/3 so far). Trying first is the fastest way to learn. 
{{ solutionSql }}
  1. {{ e }}
⏱ {{ timerLabel }}
{{ fnHelpTitle }}
{{ fnHelpText }}
Writing {{ dialectName }} · Ctrl/Cmd + Enter runs the query · Tab indents · your code is saved automatically
Output {{ out.status }}
  • {{ w }}
    •
{{ out.verdict }}
{{ out.detail }}
 
{{ out.error }}
Expected (sample data)
{{ h }}{{ v.text }}
Your output (sample data)
{{ h }}{{ v.text }}
{{ h }} {{ v.text }}
Run your query to see the result here.
🔒

To Track Your Progress, Log In / Sign Up

You have solved your 3 free questions — nice work! Log in (free) to unlock all 150 questions, keep your streak and appear on the leaderboard.

Sign Up Free Log In